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  5. absorption-calc-exam.problem

Determine the height of a packed tower that is to reduce the concentration of hydrogen sulfide in air from 0.1 kg/m³ to 0.005 kg/m³ given the following data: Water (in inlet to the tower) is free of hydrogen sulfide (H₂S) Operating temperature = 25 ^oC Operating pressure = 101.325 kPa Density of air = 1.185 kg/m³ Henrys Law constant, m = 5.522 mole fraction units Hg = 0.444 m Hl = 0.325 m Liquid flow rate = 20.5 kg/s Gas flow rate = 4.5 kg/s Molecular weight of H₂S = 34.076 kg/kmol Molecular weight of air = 28.970 kg/kmol Molecular weight of water = 18.015 kg/kmol (a) Determine the mole ratio of H₂S in the influent air.

Incorrect.

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(b) Determine the mole ratio of H₂S in the effluent air.

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(c) Determine the number of transfer units.

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(d) Determine the height of a transfer unit (in meters).

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(d) Determine the required height of the absorption unit (in meters).